Andrew Brown defends Augustine.
"I am always surprised that people misunderstand — for example — original sin as being a doctrine that sex is dirty. But when Augustine thought it was transmitted at the moment of conception, I don’t think he meant that we wouldn’t get it if our parents didn’t fuck; or, if he did, he shouldn’t have. He meant, surely, something much more like one of the central insights of Darwinism: that individual life necessarily involves differential survival, failure, great pain, and injustice. Conception in that sense is important as the moment of individuation, not the one connected to fucking. Otherwise, identical twins would have identical sins."